Problems with Pages

Hi! I just installed wordpress on 90210-media.org and I used it before and never had problems with it but there I had a header already sent error. I reuploaded the file and the error is gone but now I created quite a few pages like 90210-media.org/site/ and I see them under manage-> pages and all but when I wanna see them I get an error, I also checked ftp and it´s not there. What could the problem beo?